Set jump alignment to 4 for Cortex cores as it reduces codesize by 0.4% on...

Set jump alignment to 4 for Cortex cores as it reduces codesize by 0.4% on
average with no obvious performance difference.  See original discussion of
the overheads of various alignments:
https://gcc.gnu.org/ml/gcc-patches/2016-06/msg02075.html.

    gcc/
	* config/aarch64/aarch64.c (cortexa35_tunings): Set jump alignment to 4.
	(cortexa53_tunings): Likewise.
	(cortexa57_tunings): Likewise.
	(cortexa72_tunings): Likewise.
	(cortexa73_tunings): Likewise.

From-SVN: r247609

gcc/ChangeLog

 2017-05-04  Wilco Dijkstra  <wdijkstr@arm.com>
 
+	* config/aarch64/aarch64.c (cortexa35_tunings): Set jump alignment to 4.
+	(cortexa53_tunings): Likewise.
+	(cortexa57_tunings): Likewise.
+	(cortexa72_tunings): Likewise.
+	(cortexa73_tunings): Likewise.
+
+2017-05-04  Wilco Dijkstra  <wdijkstr@arm.com>
+
 	* config/aarch64/aarch64.c (generic_tunings): Set jump alignment to 4.
 	Set loop alignment to 8.
 

gcc/config/aarch64/aarch64.c

@@ -564,7 +564,7 @@ static const struct tune_params cortexa35_tunings =
   (AARCH64_FUSE_AES_AESMC | AARCH64_FUSE_MOV_MOVK | AARCH64_FUSE_ADRP_ADD
    | AARCH64_FUSE_MOVK_MOVK | AARCH64_FUSE_ADRP_LDR), /* fusible_ops  */
   16,	/* function_align.  */
-  8,	/* jump_align.  */
+  4,	/* jump_align.  */
   8,	/* loop_align.  */
   2,	/* int_reassoc_width.  */
   4,	/* fp_reassoc_width.  */
@@ -590,7 +590,7 @@ static const struct tune_params cortexa53_tunings =
   (AARCH64_FUSE_AES_AESMC | AARCH64_FUSE_MOV_MOVK | AARCH64_FUSE_ADRP_ADD
    | AARCH64_FUSE_MOVK_MOVK | AARCH64_FUSE_ADRP_LDR), /* fusible_ops  */
   16,	/* function_align.  */
-  8,	/* jump_align.  */
+  4,	/* jump_align.  */
   8,	/* loop_align.  */
   2,	/* int_reassoc_width.  */
   4,	/* fp_reassoc_width.  */
@@ -616,7 +616,7 @@ static const struct tune_params cortexa57_tunings =
   (AARCH64_FUSE_AES_AESMC | AARCH64_FUSE_MOV_MOVK | AARCH64_FUSE_ADRP_ADD
    | AARCH64_FUSE_MOVK_MOVK), /* fusible_ops  */
   16,	/* function_align.  */
-  8,	/* jump_align.  */
+  4,	/* jump_align.  */
   8,	/* loop_align.  */
   2,	/* int_reassoc_width.  */
   4,	/* fp_reassoc_width.  */
@@ -642,7 +642,7 @@ static const struct tune_params cortexa72_tunings =
   (AARCH64_FUSE_AES_AESMC | AARCH64_FUSE_MOV_MOVK | AARCH64_FUSE_ADRP_ADD
    | AARCH64_FUSE_MOVK_MOVK), /* fusible_ops  */
   16,	/* function_align.  */
-  8,	/* jump_align.  */
+  4,	/* jump_align.  */
   8,	/* loop_align.  */
   2,	/* int_reassoc_width.  */
   4,	/* fp_reassoc_width.  */
@@ -668,7 +668,7 @@ static const struct tune_params cortexa73_tunings =
   (AARCH64_FUSE_AES_AESMC | AARCH64_FUSE_MOV_MOVK | AARCH64_FUSE_ADRP_ADD
    | AARCH64_FUSE_MOVK_MOVK | AARCH64_FUSE_ADRP_LDR), /* fusible_ops  */
   16,	/* function_align.  */
-  8,	/* jump_align.  */
+  4,	/* jump_align.  */
   8,	/* loop_align.  */
   2,	/* int_reassoc_width.  */
   4,	/* fp_reassoc_width.  */